Velma is named on the same grave marker with Robert L. Fowler, only her birth year is inscribed on the marker, this suggests that she is possibly still living, the marker was never updated or possibly buried elsewhere. Next to her marker with Robert Fowler is her mother's marker Coma D. Ellis.

UPDATE:
The latter scenario is most likely above, this memorial will be retained as a CENOTAPH because of marker photo. According to one well-documented family tree, The Andreas Jacob Eck-"The Immigrant", it shows her married two additional times after Robert.

This family tree led to a memorial for her final resting place. Actual Burial Place
_________________________
Family:
Parents
George Morgan Dibbles 1883–abt 1920
Coma D Hurt 1886–1974

Spouse #1-married 7 Oct 1935 in Kennett, Dunklin, MO
Robert Lee Fowler
1901–1962

Spouse #2-married on 2 Mar 1964 in Riverside, CA
LeRoy A. Womack 1902-1979

Spouse #3-married on 3 Jun 1967 in Los Angeles, CA
Daniel Lewis Eck 1902–1985
1. Harrel Dean Eck 1930-1931
2. Merlville Gene Eck 1932-1933
The two above children are assigned to Velma and Daniel in memorial #

Spouse #4-married in 1990 in Oklahoma
Winton Oren Smith 1906–
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Velma Evon Dibbles in the Missouri, Marriage Records, 1805-2002
Name: Velma Evon Dibbles
Marriage Date: 7 Oct 1935
Marriage Place: Kennett, Dunklin, MO
Registration Place: Dunklin, Missouri, USA
Spouse: Robert Lee Fowler
__________________________
Below are two marriage indexes to Leroy/Roy Womack, one under her maiden name of Dibbles and other under her previously married name of Fowler.

Velma E Dibbles in the California, Marriage Index, 1960-1985
Name: Velma E Dibbles
Gender: Female
Birth Year: abt 1913
Age: 51
Marriage Date: 2 Mar 1964
Marriage Place: Riverside, California, USA
Spouse Name: Leroy A Womack
Spouse Age: 61

Velma E Fowler in the California, Marriage Index, 1960-1985
Name: Velma E Fowler
Gender: Female
Birth Year: abt 1913
Age: 51
Marriage Date: 2 Mar 1964
Marriage Place: Riverside, California, USA
Spouse Name: Roy A Womack
Spouse Age: 61
_________________________
Below are two marriage indexes to Daniel L. Eck, one under her maiden name of Dibbles and other under her previously married name of Fowler.

Velma E Dibbles in the California, Marriage Index, 1960-1985
Name: Velma E Dibbles
Gender: Female
Birth Year: abt 1913
Age: 54
Marriage Date: 3 Jun 1967
Marriage Place: Los Angeles City, California, USA
Spouse Name: Daniel L Eck
Spouse Age: 64

Velma E Fowler in the California, Marriage Index, 1960-1985
Name: Velma E Fowler
Gender: Female
Birth Year: abt 1913
Age: 54
Marriage Date: 3 Jun 1967
Marriage Place: Los Angeles City, California, USA
Spouse Name: Daniel L Eck
Spouse Age: 64
____________________________
Velma Evon Smith in the U.S., Social Security Applications and Claims Index, 1936-2007
Name: Velma Evon Smith[Velma E Eck] [Velma Smith] [Velma Evon Dibbles]
Gender: Female
Race: White
Birth Date: 15 Feb 1913
Birth Place: Portageville, Missouri [Portageville|]
Death Date: 27 Feb 2006
Claim Date: 11 Dec 1974
Father: George M Dibbles
Mother: Coma D Hurt
Citizenship or Alien Status: U.S. citizen.
Type of Claim: Duplicate request; evidence of identity only submitted.
Signature on SSN Card: Velma Evon Eck
Notes: 14 Mar 1990: Name listed as VELMA EVON SMITH; 09 Dec 1974: Name listed as VELMA E ECK; 18 Apr 2006: Name listed as VELMA E SMITH